Merge pull request #12 from lerabot/master

Adding lerabot01 example.

samples/Makefile

@@ -12,4 +12,5 @@ all:
 	$(KOS_MAKE) -C nehe03 all
 	$(KOS_MAKE) -C nehe06 all
 	$(KOS_MAKE) -C ortho2d all
-	$(KOS_MAKE) -C zclip all
+	$(KOS_MAKE) -C lerabot01 all
+	$(KOS_MAKE) -C zclip all

samples/lerabot01/Makefile

@@ -0,0 +1,30 @@
+TARGET = lerabot01.elf
+OBJS = main.o
+KOS_CFLAGS += -std=c99
+
+all: rm-elf $(TARGET)
+
+include $(KOS_BASE)/Makefile.rules
+
+clean:
+	-rm -f $(TARGET) $(OBJS) romdisk.*
+
+rm-elf:
+	-rm -f $(TARGET) romdisk.*
+
+$(TARGET): $(OBJS) romdisk.o
+	$(KOS_CC) $(KOS_CFLAGS) $(KOS_LDFLAGS) -o $(TARGET) $(KOS_START) \
+		$(OBJS) romdisk.o $(OBJEXTRA) -lm -lkosutils $(KOS_LIBS)
+
+romdisk.img:
+	$(KOS_GENROMFS) -f romdisk.img -d romdisk -v
+
+romdisk.o: romdisk.img
+	$(KOS_BASE)/utils/bin2o/bin2o romdisk.img romdisk romdisk.o
+
+run: $(TARGET)
+	$(KOS_LOADER) $(TARGET)
+
+dist:
+	rm -f $(OBJS) romdisk.o romdisk.img
+	$(KOS_STRIP) $(TARGET)

samples/lerabot01/main.c

@@ -0,0 +1,289 @@
+#include <stdio.h>
+#include "gl.h"
+#include "glu.h"
+#include "glkos.h"
+#include <time.h>
+
+extern uint8 romdisk[];
+KOS_INIT_ROMDISK(romdisk);
+
+/* floats for x rotation, y rotation, z rotation */
+float xrot, yrot, zrot;
+
+/* storage for one texture  */
+int texture[1];
+
+/* Image type - contains height, width, and data */
+struct Image {
+    unsigned long sizeX;
+    unsigned long sizeY;
+    char *data;
+};
+typedef struct Image Image;
+
+// quick and dirty bitmap loader...for 24 bit bitmaps with 1 plane only.
+// See http://www.dcs.ed.ac.uk/~mxr/gfx/2d/BMP.txt for more info.
+int ImageLoad(char *filename, Image *image) {
+    FILE *file;
+    unsigned long size;                 // size of the image in bytes.
+    unsigned long i;                    // standard counter.
+    unsigned short int planes;          // number of planes in image (must be 1)
+    unsigned short int bpp;             // number of bits per pixel (must be 24)
+    char temp;                          // temporary color storage for bgr-rgb conversion.
+
+    // make sure the file is there.
+    if ((file = fopen(filename, "rb"))==NULL)
+    {
+        printf("File Not Found : %s\n",filename);
+        return 0;
+    }
+
+    // seek through the bmp header, up to the width/height:
+    fseek(file, 18, SEEK_CUR);
+
+    // read the width
+    if ((i = fread(&image->sizeX, 4, 1, file)) != 1) {
+        printf("Error reading width from %s.\n", filename);
+        return 0;
+    }
+    printf("Width of %s: %lu\n", filename, image->sizeX);
+
+    // read the height
+    if ((i = fread(&image->sizeY, 4, 1, file)) != 1) {
+        printf("Error reading height from %s.\n", filename);
+        return 0;
+    }
+    printf("Height of %s: %lu\n", filename, image->sizeY);
+
+    // calculate the size (assuming 24 bits or 3 bytes per pixel).
+    size = image->sizeX * image->sizeY * 3;
+
+    // read the planes
+    if ((fread(&planes, 2, 1, file)) != 1) {
+        printf("Error reading planes from %s.\n", filename);
+        return 0;
+    }
+    if (planes != 1) {
+        printf("Planes from %s is not 1: %u\n", filename, planes);
+        return 0;
+    }
+
+    // read the bpp
+    if ((i = fread(&bpp, 2, 1, file)) != 1) {
+        printf("Error reading bpp from %s.\n", filename);
+        return 0;
+    }
+    if (bpp != 24) {
+        printf("Bpp from %s is not 24: %u\n", filename, bpp);
+        return 0;
+    }
+
+    // seek past the rest of the bitmap header.
+    fseek(file, 24, SEEK_CUR);
+
+    // read the data.
+    image->data = (char *) malloc(size);
+    if (image->data == NULL) {
+        printf("Error allocating memory for color-corrected image data");
+        return 0;
+    }
+
+    if ((i = fread(image->data, size, 1, file)) != 1) {
+        printf(stderr, "Error reading image data from %s.\n", filename);
+        return 0;
+    }
+
+    for (i=0;i<size;i+=3) { // reverse all of the colors. (bgr -> rgb)
+        temp = image->data[i];
+        image->data[i] = image->data[i+2];
+        image->data[i+2] = temp;
+    }
+
+    // we're done.
+    return 1;
+}
+
+// Load Bitmaps And Convert To Textures
+void LoadGLTextures() {
+    // Load Texture
+    Image *image1;
+
+    // allocate space for texture
+    image1 = (Image *) malloc(sizeof(Image));
+    if (image1 == NULL) {
+        printf("Error allocating space for image");
+        exit(0);
+    }
+
+    if (!ImageLoad("/rd/flag1.bmp", image1)) {
+        exit(1);
+    }
+
+    // Create Texture
+    glGenTextures(1, &texture[0]);
+    glBindTexture(GL_TEXTURE_2D, texture[0]);   // 2d texture (x and y size)
+
+    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); // scale linearly when image bigger than texture
+    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); // scale linearly when image smalled than texture
+
+    // 2d texture, level of detail 0 (normal), 3 components (red, green, blue), x size from image, y size from image,
+    // border 0 (normal), rgb color data, unsigned byte data, and finally the data itself.
+    glTexImage2D(GL_TEXTURE_2D, 0, 3, image1->sizeX, image1->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, image1->data);
+};
+
+/* A general OpenGL initialization function.  Sets all of the initial parameters. */
+void InitGL(int Width, int Height)	        // We call this right after our OpenGL window is created.
+{
+    LoadGLTextures();
+    glEnable(GL_TEXTURE_2D);
+    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);		// This Will Clear The Background Color To Black
+    glClearDepth(1.0);				// Enables Clearing Of The Depth Buffer
+    glDepthFunc(GL_LESS);				// The Type Of Depth Test To Do
+    glEnable(GL_DEPTH_TEST);			// Enables Depth Testing
+    glShadeModel(GL_SMOOTH);			// Enables Smooth Color Shading
+
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();				// Reset The Projection Matrix
+
+    gluPerspective(45.0f,(GLfloat)Width/(GLfloat)Height,0.1f,100.0f);	// Calculate The Aspect Ratio Of The Window
+
+    glMatrixMode(GL_MODELVIEW);
+    glEnable(GL_LIGHTING);
+    glDisable(GL_LIGHT0);
+    glEnable(GL_LIGHT1);
+    glEnable(GL_COLOR_MATERIAL);
+
+    GLfloat l1_pos[] = {5.0, 0.0, 1.0, 1.0};
+    GLfloat l1_diff[] = {1.0, 0.0, 0.0, 1.0};
+    GLfloat l1_amb[] = {0.5, 0.5, 0.5, 1.0};
+
+    //glLightfv(GL_LIGHT1, GL_AMBIENT,  l1_amb);
+    glLightfv(GL_LIGHT1, GL_DIFFUSE,  l1_diff);
+    glLightfv(GL_LIGHT1, GL_POSITION, l1_pos);
+}
+
+/* The function called when our window is resized (which shouldn't happen, because we're fullscreen) */
+void ReSizeGLScene(int Width, int Height)
+{
+    if (Height == 0)				// Prevent A Divide By Zero If The Window Is Too Small
+        Height = 1;
+
+    glViewport(0, 0, Width, Height);		// Reset The Current Viewport And Perspective Transformation
+
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+
+    gluPerspective(45.0f,(GLfloat)Width/(GLfloat)Height,0.1f,100.0f);
+    glMatrixMode(GL_MODELVIEW);
+}
+
+void DrawTexturedQuad(int *tex, float x, float y, float z)
+{
+  GLfloat texW = 10;
+  GLfloat texH = 10;
+  GLfloat x0 = x - texW / 2;
+  GLfloat y0 = y - texH / 2;
+  GLfloat x1 = x + texW / 2;
+  GLfloat y1 = y + texH / 2;
+  GLfloat color[] = {1.0f, 1.0f, 1.0f, 1.0f};
+  GLfloat mat_ambient[] = {1.0f, 1.0f, 1.0f, 1.0f};
+
+  GLfloat vertex_data[] = {
+  	/* 2D Coordinate, texture coordinate */
+  	x0, y1, z,
+  	x1, y1, z,
+  	x1, y0, z,
+  	x0, y0, z
+  };
+
+  GLfloat uv_data[] = {
+  	/* 2D Coordinate, texture coordinate */
+  	0.0f, 1.0f,
+  	1.0f, 1.0f,
+  	1.0f, 0.0f,
+  	0.0f, 0.0f
+  };
+
+  GLfloat normal_data[] = {
+  	/* 2D Coordinate, texture coordinate */
+  	0.0, 0.0, 1.0,
+  	0.0, 0.0, 1.0,
+  	0.0, 0.0, 1.0,
+  	0.0, 0.0, 1.0
+  };
+
+  GLfloat color_data[] = {
+  	/* 2D Coordinate, texture coordinate */
+  	color[0], color[1], color[2], color[3],
+  	color[0], color[1], color[2], color[3],
+  	color[0], color[1], color[2], color[3],
+  	color[0], color[1], color[2], color[3]
+  };
+
+  //GLint indices[] = {0,1,2,3,2,3};
+
+  glEnable(GL_TEXTURE_2D);
+  glBindTexture(GL_TEXTURE_2D, tex);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+  glEnableClientState(GL_VERTEX_ARRAY);
+  glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+  glEnableClientState(GL_NORMAL_ARRAY);
+  glEnableClientState(GL_COLOR_ARRAY);
+
+  glVertexPointer(3, GL_FLOAT, 0, vertex_data);
+  glTexCoordPointer(2, GL_FLOAT, 0, uv_data);
+  glNormalPointer(GL_FLOAT, 0, normal_data);
+  glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, mat_ambient);
+
+  glEnable(GL_BLEND);
+  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+  glVertexPointer(3, GL_FLOAT, 0, vertex_data);
+  glDrawArrays(GL_QUADS, 0, 4);
+
+
+  glDisableClientState(GL_VERTEX_ARRAY);
+  glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+  glDisableClientState(GL_NORMAL_ARRAY);
+  glDisableClientState(GL_COLOR_ARRAY);
+}
+
+
+float delta = 0;
+/* The main drawing function. */
+void DrawGLScene()
+{
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);		// Clear The Screen And The Depth Buffer
+    glLoadIdentity();				// Reset The View
+    //glTranslatef(-5.0f, -5.0f, -10.0f);
+    glTranslatef(-50.0f, 0.0f, -200.0f);
+
+    GLfloat l1_pos[] = {50 + sin(delta) * 100.0f, 25.0, 1.0, 1.0};
+    delta+= 0.03;
+
+    glLightfv(GL_LIGHT1, GL_POSITION, l1_pos);
+    //glLightfv(GL_LIGHT1, GL_SPOT_EXPONENT, 3);
+    DrawTexturedQuad(texture[0], l1_pos[0], l1_pos[1], l1_pos[2]);
+
+    for (int i = 0; i < 5; i++)
+      DrawTexturedQuad(texture[0], i * 20, 0.0f, 0.0f); // Draw the textured quad.
+    // swap buffers to display, since we're double buffered.
+    glKosSwapBuffers();
+
+}
+
+int main(int argc, char **argv)
+{
+    glKosInit();
+
+    InitGL(640, 480);
+    ReSizeGLScene(640, 480);
+
+    while(1) {
+        DrawGLScene();
+    }
+
+    return 0;
+}